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I have a matrix (input) and want to export it as a text file (output), therefore, I am using the following code in matlab:

save('out.txt', 'input', '-ASCII');

My question is that how I can insert for example 3 lines (as follow) for its header? I don't want to open the output.txt file in another program, because the size of the output.txt is very large and non of the available softwar can open it. Therefore, I want to do this directly in matlab. 

These data set are...
It is created by
2013
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1 Answer

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I think you cannot do it using only save function. For a quick, I can see two options that might be useful.

First. Create a file with the header and then use save with -append options:

input = rand(5);
header = ['These data set are It is created by 2013'];

fileID = fopen('out.txt','w');
fprintf(fileID,'%s\n', header);
fclose(fileID);

save('out.txt', 'input', '-ASCII', '-append');

Second. Instead of using save, manually use fprintf to write everything:

input = rand(5);
header = ['These data set are It is created by 2013'];

fileID = fopen('out.txt','w');
fprintf(fileID,'%s\n', header);
fprintf(fileID,[repmat('%f ', [1, size(input, 2)]),'\n'], input);
fclose(fileID);

If u want multi-line header, u can do as follows:

header = ['These data set are ...\nIt is created by\n2013'];


fileID = fopen('out.txt','w');
fprintf(fileID, [header, '\n']);
fprintf(fileID,[repmat('%f ', [1, size(input, 2)]),'\n'], input);
fclose(fileID);
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